The inner layer (or the synovial layer) is richly supplied with blood vessels and made up of the serous connective tissue.The outer fibrous layer comprises white fibrous tissue that holds the joint together and supports the synovium.The articular capsule is made up of two layers. The articular capsule encloses the diarthrodial joint and is in continuation of the periosteum of articulating bones.Credit: OpenStax College, CC 3.0.Īccordingly, the essential component of the diarthrodial or synovial joints are: Figure 1: Basic structure of a diarthrodial or synovial joint. Additionally, the ends of the articular bones are encased in a protective cartilaginous layer known as articular cartilage. The fluid present in the joint cavity, known as synovial fluid, provides the required smoothness and lubrication to the bones for motion. Within the articular capsule, the synovial membrane creates a fluid-filled sac or the joint cavity. The articular capsule is made up of cartilage and fibrous tissues. Structure of diarthrodial joint or synovial jointĭiarthrodial joints are freely moving joints wherein the joint is encased in an articular capsule, and the bones connect with each other in a fluid-filled cavity known as the synovial cavity. Diarthrodial joints are the most common joint found in the body of mammals. Amphiarthroses are cartilaginous jointsįrom the above classification, it can be concluded that all the synovial joints of the body are the diarthrodial joints and are involved in the majority of the body movements.Histologically or structurally – based on the type of connective tissue in the joint, there are three types of joints:Ĭorrelating these two classifications leads to the following conclusions: Freely movable joints or mobile joints, i.e., diarthrosis.Slightly movable joints, i.e., amphiarthrodial joints.Immovable joints, i.e., synarthrosis joints.Functionality – based on the amount of mobility, there are three types of joints: Different types of joints in the body can be classified in two ways:Ī. Joints or articulations are the connecting point between the two bones that provide the required mobility and stability to the skeletal system. This fluid helps your joints move smoothly.To better understand the diarthrodial joints, we must understand the joints and the classification of the joints. If you have gout, you may have crystals of uric acid in your synovial fluid, the substance that surrounds joints. Uric acid can also lead to kidney stones. Then crystals of uric acid can form and collect in the joints. Uric acid levels can also increase when you eat too many high-purine foods or take medicines such as diuretics, aspirin, or niacin. But if your body makes too much uric acid, or if your kidneys aren't working well, uric acid can build up in the blood. When purines break down into uric acid in the blood, the body gets rid of the acid when you urinate or have a bowel movement. They can also be formed in the body when DNA is broken down. They are also found in many foods, such as liver, shellfish, and alcohol. Purines are natural substances found in the body. It forms when chemicals called purines break down. Uric acid is a normal body waste product. The synovial fluid uric acid test measures levels of uric acid that can collect in joint fluid.
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